Automatic heat-regulating device



3 Sheets-Sheet 1.

(No Model) I J1.v.s"roUT.

AUTOMATIC `HEAT RBGULATING DEVICE.

No. 560,763. Patented May 26,1896.

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WITNESSES 3 Sheets iNo Model.)v

Sheet. 2.

J.V.STOUT. t AUTOMATIC HEATy REGULATING DEVICE. N6. 666,766.

Patented May 26.1896.

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INVENTOR.

Wl TNESSES V A TTORNEYS,

(No M0661.) 3 sheets-sheet 3. J.V.STOUT.

AUTOMATIC HEAT REGULATING DEVICE. No. 666,763. 1266611666-M@ 26, 1696.

INVENTOR,

A TTORN E YJ ANDREW B GRMIAM4 PHOTWLHNQWASHINGTON, D.C.

" UNTTED STATES t ATENT OFFICE.

JOIIN V. STOUT, OF EASTON, PENNSYLVANIA.

i AUTOMATIC H EAT-REG U LATING DEVICE.

SPECIFICATION forming part of Letters Patent No. 560,763, dated May 26,1896.

Application filed Tune 6,1895. Serial No. 551,918. (No model.)

To aZZ'wi/om t nur/y concern:

3e itknown that I, JOHN V. STOUT, a citizen of the United States, andaresident of Easton, county of Northampton, and State of Pennsylvania,have invented certain new and useful Improvements in Automatic Heat-Regulating Devices, of which the following is a speciiication.

My invention relates to that class of auto matic temperature-regulatingapparatus in which a main heat-controlling valve, damper, draft, orventilator is actuated by fluid-pressure, controlled by an auxiliaryvalve, which is in turn governed by a thermostat.

The invention consists in various novel features, details, andcombinations hereinafter pointed ou t, whereby certainty and eiiiciencyof action are secured, together with simplicit-y and durability.

In the accompanying drawings, Figure l is aside elevation of` theworking parts of my apparatus, showing the shell or casing of theauxiliary valve in section. Figs. 2, 3, 4f, and 5 are views ofslightly-varying forms of` the auxiliary valve, the shell or casin gbeing similarly in section. Fig. 6 represents the apparatus of Fig. lapplied to a steam-radiator.

In order to secure a proper degree of sensitiveness in apparatus of thischaracter, it is now the practice to employ the thermostat or theheat-measuring device merely to bring into action more powerfulmechanism for actuating the main valve, damper, or other device whichdirectly or immediately controls the temperature. In the presentinstance I make use of a fluid-pressure motor or device to move the mainvalve, damper, orheatcontroller, and I regulate the pressure of Huid insaid motor or device by an auxiliary valve operated by an electromagnet,the energizing-circuits of which are closed and opened as required by athermostat or a heat-measuring instrument. So far as I am aware the mostperfect or satisfactory temperature-regulating systems heretoforeproposed or adopted have, for thepurpose of avoiding the necessity ofastu'ffingbox or packinggland, placed part or all of the electricalapparatus Within the valveecasing, thus exposingthe circuitbreakers tothe actuating medium. Such arrangement, while obviating theobjectionable friction of stufling-glands, is nevertheles obj ectionablefor the reason that it requires the employment of an actuating fluidwhich shall not affect the electrical contacts and cause the circuit tobe closed or short-circuited at an improper time, air being the mediumusually employed under such circumstances and the use of water and steambeing precluded. When air is employed, an air-pump or compressingapparatus is necessarily included in the apparatus, and this is for manyreasons undesirable.

The chief object of this invention is to provide an apparatus which canbe directly actuated by water or steam without liability ofinopportunely closing the electrical circuits or short-circuiting thecurrent and without danger of permitting the escape of the actuatingiluid into the apartment in which the device maybe located. In this wayI avoid the expense of the air-pumpand the trouble and annoyanceincident to its use, and also dispense with stuffing boxes or glands,thereby obviating the friction which so materially interferes with thesensitiveness of regulation.

Having thus stated in general terms the nature of my invention, I willproceed to describe the same in detail, with the aid of the drawings,observing, however, that the selection of steam heating apparatus ismerely for convenience of illustration, and that any form or system ofheating apparatus may be employed.

Referring first to Figs. lV and 6, which show the preferred embodimentof my invention,

P indicates a pipe or conduit for conveying the heating medium oragent-steam, hot water, heated air, or other. This pipe or conduit willcommunicate with the heat-generator, a steam-boiler being contemplatedin Figs. l and G, as indicated by the character of the pipe and valveand by the connected radiator R of Fig. G. V indicates a main valve orcontrolling device applied to pipe P and bearing at the outer end of itsstem a convex disk 7 beneath which bears one end of a coiled spring 8,encircling the valve-stem, the other end of said spring resting upon thevalve-casing. The purpose of the sprin g isto open the valve V whenrelieved of huid-pressure. The disk IOO 7 rests against the under orouter face of the y flexible diaphragm of a fluid-pressure chamf ber ormotor 5, of which said diaphragm constitutes the moving member, and saidchamber communicates by means of a pipe 6 with a fluid-pressure-supplypipe 2, provided with an auxiliary valve hereinafter described.

'The huid-pressure pipe may be placed in comits actuating devices, thesections being con-` veniently screwed together, as indicated. In Figs.l and G, g indicates the valve which controls delivery of Huid underpressure to chamber or motor 5. As there shown, it consists of a diskcarried at the lower end of a stem t', passing longitudinally through athreaded nipple f, screwed through a central opening in the lower end ofsection a of the valvecasing and extending downward into the interior ofsection c thereof. At its upper end the stem t' bears a head or buttonj, beneath which presses the upper end of a coiled spring 7c, the lowerend of which rests upon a collar or shoulder of the nipple f. Under thisconstruction the nipple f may be raised and lowered at will withoutdisturbing the relation thereto of either the valve-disk g or the spring7c. Directly above and axially in line with the valve g and its stem iis a second stem l, provided with a disk m, designed to seat upon and toseal the mouth or collar n of the passage through which stem Z extends,said passage being here represented as formed through the otherwiseclosed lower end of section b of the auxiliary-valve casing. The upperen d of said section b is provided with a screw-threaded cap or top C,which is extended outward to constitute a frame or support forelectrical appliances hereinafter described. Passing through the cap ortop C is a stem q, bearing at its lower end a disk p, adapted to seatagainst and seal the mouth or lower end of the opening through which thestem q passes. As shown in Figs. l and 6, this opening is enlarged inits lower part to receive a coiled spring 0, which exerts a constantdownward pressure upon disk 29. Vhcn the disk p is free to descend andis thus pressed down, it depresses stem l, which in turn acts upon diskj and through stemt' moves disk g away from its seat. In doing this thestem (j forces disk m to its seat on the collar ai., and thus closescommunication between sections a and b of the valve shell or casing.Hence fluid entering chamber a through the unsealing of valve g is atthe same time precluded from entering chamber b. Stem i' must of coursebe of such length relatively to that of the nipple as will permit disk gto be unseated without sealing the upper end of the nipple by head orbuttonj. The pipe 6,by which fluid under pressure is conveyed to chamberor motor 5, communicates with section 0L of the auxiliary valve shell,being conveniently screwed into a nipple formed at the side thereof, anda similar nipple is formed at the side of chamber or section b, throughwhich is formed an exhaust-passage. Said passage may open directly tothe atmosphere, or a waste-pipe e may be screwed into said nipple, asshown. Vhere water, steam, or gas is employed as the source or medium offluid-pressure, the pipe e will ordinarily be used, but with compressedair it will not be necessary ordinarily. It will be observed that thestem t' is of smaller diameter than stem Z, and that a larger spaceexists for the iiow of fluid between stem z' and its surrounding wallsthan between stem Z and the walls of the passage in which it stands.This relatively greater capacity of passage is important for the reasonthat it insures automatic relief of the iluid pressure motor from excessof pressure. ln constructing and adjusting the mechanism theexhaust-valve m is set to withstand a predetermined pressure, but to belifted from its seat whenever that pressure is exceeded, thus accuratelydetermining the maximum pressure to which the diaphragm of huid-pressuredevice 5 maybe subjected. When the pressure falls to normal state, theexhaustvalvc will close, but so long as valve g is open thepressure-motor 5 will receive its proper supply and no more. Thisprovision effectually guards against rupture or injury of theiuidpressure motor and is particularly important where a rubberdiaphragm is employed.

From therforegoing description it will be seen that the auxiliary valveg and the escapevalve m are wholly contained within the shell or casing,and that the stem q, which actuates or controls them, is furnished witha sealingdisk p, which precludes escape of fluid when the escape-valveis opened. The valve-actuating stem is wholly above the exhaust-valveand out of contact with the fluid under pressure in all embodiments ofmy invention, which feature is of considerable practical importance. Bymaking the stems of the inlet and exhaust valves and the operating-stem(or some of them) separate and independent the minimum of friction maybesecured without such accurate fitting and adjustment as would berequired if a single stem were used. The disk p and valve g can also beseated without the close adjustment that would be necessary were both onone stem. The valvestems iitting loosely in their passages, the valvesmay be accurately seated and tightly closed with a minimum force orpressure.

Having now described' the construction of the valves and their relationto each other, it remains to explain the thermostatic and electricaldevices whereby their action is primarily controlled.

The cap C of the auxiliary valve shell or lOO IIO

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casing is fashioned into aframe r, from opposite ends of which rise twostandards. Between these standards and secured in any convenient way toframe r are two electromagnets M and M'. Pivotally attached toone of thestandards of frame r and extending across the top of electromagnet M isa lever s,the free end of which carries an insulated contact spring orplate 37 which when the magnet is denergized rests upon aninsulatingblock, to which is secured a contact-plate 36. To the otherstandard of frame r is pivoted an elbow lever or latch u, which bearsagainst the outer end of lever s when magnet M is deenergized, but whichis thrown inward by a spring 29, or it may swing inward by gravity andengage over the lever s when magnet M is energized and caused to attractthe armature t of said lever, thereby depressing the lever, as in Figs.2 and 3. Levers is normally urged upward by a sprin g y, encircling astem extending upward from frame r, and in rising the lever elevates rodor stem q, thereby seating valve-disk j), the power of spring ybeing-superior to that of spring o or other force tending to throw diskp away from its seat. Latch or lever u is provided with an armature fuof soft iron, so that when magnet M is energized it shall attract thearmature, rock the lever, and carry its lower arm off from over thelever s, thus permitting said lever to rise under the action of springy. Latch or lever u carries an insulated contact spring or finger 33,which rests upon an insulated contact-plate 34 when armature o isattracted to magnet M', but which rides off of said plate when thelatch-lever swings to locking position over lever s.

B indicates an electric generator or source of electric-current supply,and 31 a thermostat of any suitable form, preferably a bimetallic bar,having one end electrically connected with a terminal of the generatorand the other end arranged to play between two adjustable contacts 32and 35. Contact 35 is connected by a conductor 51 with one end of thehelix of electromagnet M, the other end thereof being connected byconductor 52 with contact 34. A conductor 53 extends from contact-finger33 to the second terminal of the generator B, and a conductor 54connects contact-finger 37with conductor 53, and thus with thegenerator. Lastly, a conductor 55 connects contact 32 with one end ofthe helixof electromagnet M', the other end of which is electricallyconnected with contact-plate 36.

The direction of flow of the current will of course depend upon theorderin which the connections are made with the generator;

but assuming conductor 53 to be connected Awith the positive pole, asindicated, and that the bar 31 be arranged to contact with screw 35 whenthe temperature rises and with screw 32 when it falls from the normal,the action will be as follows: The heat-supply valve being open, asindicated in Figs. 1 and, the temperature will rise in the apartment inwhich thermostat 31 is located and its bar will swing to contact-screw35, thus causing a circuit to be established from generator B byconductor 53 and contacts 33 and 34 to helix of magnet M, and thence byconductor 51, contact 35, and bar 31 back to generator B. This willcause magnetM to be energized and to attract armature t, thereby drawingVdown lever s against the pressure of spring y and permitting spring oto carry down the rod q, which, acting upon disk m, will seat it uponcollar n and cause its stein to carry down the stemt and thus unseatvalve g. In this wayy iiuid under pressure will be permitted to enter bypipe 6 into fluid -pressure chamber or motor 5, where it will act uponthe iiexible diaphragm or other movable member and cause it to pressdown the stem of valve V, closing said valve and shutting off theheat-supply. As the end of lever s is carried below the depending arm oflatch or lever u said arm swings in above lever s and locks it againstrising, thereby insuring the continued opening of the auxiliary valve guntil the temperature falls to a predetermined limit. In thus swingingto locking position the latch-lever u carries the contact-finger 33 offof plate 34 and thus opens or breaks the circuit in which magnet M wasincluded, thereby avoiding waste of current. At the same time lever s indescending carries contact-finger 37 into position to bear uponcontact-plate 36, thus connecting the helix of magnet `M with conductorfand thus with conductor 53 and the generator. If now the temperaturefall so low as to cause the thermostatbar 31 to make contact with screw32, a circuit will be established from generator B by conductor` 53,'branch 54, contacts 37 and 36, the helix of magnet M', and conductor 55to contact-screw 32, and thence by thermostatbar 31 to generator B. Thiscircuit including,

as it does, the magnet M', said magnet will be energized and willattract its armature o, thereby rocking latch-lever u and causing itsend to swing off from and to release lever s, which will at `once riseunder the force of spring y. Inthus rising lever s will elevate rod orstem q, leaving spring lo free to lift stem 'a' and thereby to closevalve g, which will be further held to its seat by the fluidpressurebeneath it. As valve g rises its stem lifts stem Z and unseatsvalve-disk m, thus venting fluid-pressure chamber 5 and leaving valve Vfree to open. As the lever s rises it carries apart the contacts 36 and37 and thus breaks the circuit of magnet M', but not until the end ofsaid lever passes in frontof the latch-lever and prevents it fromresuming its locking position. The rise of lever s also causeslatch-lever u to swing about its pivot and to reestablish connectionbetween contacts 33 and 34. It will thus be seen that the action of thebattery is but momentary, whether opening or closing the heat supply.Mention has already been made of the fact that valve m acts asasafety-valve or IOO IIO

relief for the fluid-pressure chamber or motor 5. In order that thisaction may take place in connection with the electrical mechanismdescribed and shown, it is necessary that the rod or stem q be free torise independently of lever s, as otherwise it could not rise when thelever is depressed and locked, as it is when valve gis open, and thedangerous pressure is liable to occur. A convenient connection isillustrated in Figs. l and G, where the stem q is represented as passingfreely through an opening in lever s and carrying above said lever awasher and an adjusting-nut w. Obviously a weight may be substituted forspring o, and any convenient form of loose or sliding connection adoptedin lieu of that just described. Thus I have shown in Fig. 2 a weight XV,applied to stem q and having a slotted connection with link z, by whichit is suspended from lever s. So, too, without departing at all from thespirit of my invention, a spring o may be arranged to extend all the wayfrom disk p to the under side of lever s, as shown in Fig. 3, rod q ofsaid iigure being the same as rod q of Figs. l and 6. Again, thevalve-disks g and m of Figs. l and 6 may be carried by a continuousstein, or, in other words, the stems t' and Z of said figures may beunited, as in Fig. 3, in which the parts mentioned are designated by theletters g', my', t", and l', the seat for valve g being lettered 7L',and the liftin g-sprin g of valve m' being lettered 7c. Under thismodified construction a like difference between the capacities of theinlet and exhaust passages will be observed. The inlet and outletconnections are designated by the letters d and e in said figure.

In Fig. at I have shown the auxiliary valve arranged merely to controlthe exhaust, and have represented a chain connection 2S between stem qand lever s. Provision for adjustment is made by arranging a plug or nut17 to screw more or less into and out of the top of the auxiliary valveshell or casing, and by like construction of the nipple 13, in which isguided stem 15, carrying the valve m. In order that the proper relationbetween the inlet and exhaust passages may be secured, a reducing plugor screw 9 may be carried through the side of pipe 2 to restrict thepassage through it.

Fig. 5 shows a chain 4:5 and a weight 4i, from which depends a stem 42,carrying a disk m", which constitutes the exhaust-valve and correspondsto disks m and m of other figures. In this case the connection betweenthe actuating-stem and the valve-disk is direct instead of being madethrough an intermediate. So, too, the difference in area of inlet andexhaust passages is here secured through the use of a nipple 39, havinga passage 40, smaller than the passage of nipple .tl above it, andadjustment of the valve m and its seat is secured by screwing the nipple13 up or down through collar or diaphragm l2.

' The lateral necks l and 4:0 represent the connections for the pipes Gand e, respectively.

It will be noted that in all the forms of apparatus represented theexhaust -valve is adapted to act as a relief or safety valve to protectthe fluid-pressure motor 5 against injury, and that the relatively smallinlet and large outlet are common to all the forms shown and essentialwhere such protection is to be secured. It, however, this feature bedeemed unimportant in any particular instance, it may be omitted, thoughin its most perfect embodiment the invention includes such protection.The top is shown closed by a screw-plug 43. The interior of sectionb ofthe auxiliary-valve casing, or the space in which valve m is located,constitutes an expansion-chamber in which the ll'uidpressure isdissipated, so that there\ is no liability of back pressure upon andinterference with valve m. This is of considerable importance whenelastic fluids are employed.

Various other minor changes may be made in the structure withoutdeparting from the limits of my invention.

Springs and weights being recognized as equivalents for most purposes inmechanical structures, it is to be understood that either may beemployed where springs are shown in the drawings, and for this reason Ishall use in the claims the term yielding pressure device, meaningthereby to include either springs or their eqnivalents-weights Vhile theform ol` springs is not essential, I prefer to employcompression-springs, as shown.

As above indicated, the connection between the valves themselves andbetween the electrical mechanism and the valves may be rigid stems orany other operative connections, as chains or the like.

In speaking ot the auxiliary-valve apparatus as being in a pipe orconduit between the motor and the Huid-pressure source it is of courseto be understood that the term pipe includes any chamber or spacebetween said parts.

lVhile I have, for convenience of description, spoken of thevalve-casing as comprising three parts d, l), and c, it will be observedthat the part c is not a necessary part ofthe casing, and may, in fact,be merely a coupling, T, or other connection. The three-partconstruction is a mere matter of convenience.

Fig. 5 shows the expansion-chamber in the form of a T or coupling, or asingle body or casting comprising the parts represented as separatesections a and b in Fig. l.

Having thus described my invention, what I claim is l. In aheat-regulating apparatus, the combination of a main valve to controlthe flow of heating fluid; a motor for moving said valve; a source ofhuid-pressure; a pipe connecting said motor with the source of pressure;an auxiliary-valve apparatus in said pipe, comprising an inlet-valve foradmitting pressure Iof IIC

to, and an exhaust-valve y for relieving the pressure in the motor; anelectrical device for moving said valves in one direction; mechanicalmeans for holding the valves in the positionto which they are thusmoved; means for moving the valves in the opposite direction; anon-packed operative connection between said valves and said electricaldevice located exteriorly to thel valve-casing, and entirely above theexhaust-passage of said valve; and athermostat for controlling saidelectrical device. y i

2. In a heat-regulating apparatus, the combination of a main valve tocontrol the flow of heating Huid; a motor for moving saidvalve; a sourceof fluid-pressure; a conduit connecting the motor and the source ofpressure; an auxiliary-valve apparatus in `said conduit, comprising aninlet-valve for admitting the -liu-id under pressure to, and anexhaust-valve for relieving or venting the motor an expansion-chamber onthe delivery side of said exhaust-valve; a waste-passage for saidexpansion-chamber, said expansionchamber and waste-passage being oflarger capacity than the exhaust-passage an electric motor; a nonpackedguide or passage way between said electric motor and the exhaust-valve;an operative connection between said valves andsaid electric motor, saidconnection extending through said non-packed guide or passage;

and a thermostat for controlling the electrical' let-valve, for ventingor relieving the motor;

an electrical device for moving said valve in one direction; means formoving said valves in the opposite direction; an expansion-chamb er anda waste-passage between said electrical device and said exhaust-valve,said chamber and waste-passage being ot' larger capacity than the saidexhaust-valve; a nonpacked passage between said electrical device andsaid expansion-chamber; an operative connection betweensaid electricalapparatus and said exhaust-valve, extending through said non-packedpassage; and a disk or valve for excluding fluid from said passage whensaid exhaust-valve is opened. y

et. In combination with a main heat-controlling valve or device; afluid-pressure motor for actuating the same; a source of fluidpressure;a valve shell or easing provided with an exhaust-passage for escape ofiiuid from the motor; a valve to close said passage; an unpacked stembearing upon the exhaustvalve; and a disk carried by said stem andserving to seal the opening through which the stem passes, when saidexhaust-valve is open.

5. The combination in an automatic heatregulating apparatus, of a mainvalve for coni trolling the heat supply a motor for actuating saidvalve; a source of fluid-pressure; a pipe or conduit connecting themotor with the source of fluid-pressure; an-auxiliary-valve apparatus insaid pipe or conduit, comprising a casing having an inlet port andvalve, a discharge-port leading to the motor, an exhaust port or valve,and means for holding said exhaust-valve yieldingly against `its seatwhen pressure is on the motor; an electric motor for controlling andactuating the auxiliary valve, and a thermostat serving to control theaction of the electric motor.

6. In an automatic heat-regulatin g apparatus, the combination of a mainvalve for controlling the heatsupply; a motor for actuating said valve;a source of fluid-pressure; a `pipe connecting the motor with the sourceof fluid-pressure; an auxiliary-valve apparatus in said pipe, comprisinga casing having an inlet-port and a valve for the same, a discharge-portleading to the motor, an exhaust vport and valve, said exhaust-valvebeing operatively connected with said inlet-valve and adapted to movetherewith, and .means for holding said exhaust-valve yieldinglyr againstits seat when pressure is on the motor,whereby said valve is enabled tooperate as a safetyvalve to prevent undue` pressure upon the motor. y ii 7. In aheat-regulating apparatus, the combination of a main valve; amotor for actuating the same to control the heat supply; a source offluid-pressure; a pipe or conduit connecting the motor with the sourceof fluidpressure; an auxiliary-valve apparatus in said pipe, comprisinga casing having an inlet passage or port leading to the motor, aninlet-valve controlling said port, an exhaust passage or port, and avalve of larger capacity than the inlet passage or port,whereby apredetermined yielding pressure against said exhaust-valve will enableit to discharge any excess of pressure on the motor, but saidpredetermined pressure will open said inletvalve 'against a greaterpressure than that at which said exhaust-valve is adj usted to open,thereby relieving the pressure on said motor; an electric motor foractuating said auxiliaryvalve apparatus; and a thermostat controllingthe action of the electrical device.

S. In an automatic temperature-regulating apparatus, the combination ot'a main heatcontrolling valve; a motor for actuating said valve; a sourceof fluid-pressure; a pipe or conduit connecting said motor with thesource of Huid-pressure; an auxiliary-valve apparatus in said pipe,comprisinga casinghaving an inletport and valve, a port leading to themotor, an exhaust port and valve, said exhaustvalve being operativelyengaged with said inlet-valve, and means for holding said exhaustvalveyieldingly against` its seatwhen pressure is on the motor, whereby saidvalve is enabled to discharge any excess of pressure on the motor; and anon-packed stem arranged IOO IIC

to act upon the exhaust-valve, and adapted to exertapredeterminedyielding pressure upon the exhaust-valve when the latter is closed.

9. In a heat-regulating system, the combination of a mainheat-controlling valve; a motor for actuating said valve; a source ofHuid-pressure; a pipe or conduit connecting the motor with said sourceof fluid-pressure; an auxiliary-valve apparatus in said pipe, comprisinga valve-body having a restricted inlet, a valve for controlling theinlet, a discharge-passage leading to the motor, an exhaust-port ofgreater capacity than the inlet, an exhaust-valve for controlling thesame, and an actuating-stein separate from the valvestem engaging saidvalve to hold it against its seat with a predetermined yielding pressurewhen said exhaustvalve is closed; and a thermostatically-controlledelectric motor for actuating said stein.

10. In an automaticheat-controllin g apparatus of the characterdescribed, the combination of a main heat-controlling valve; a motor foractuating said valve; a source of fluidpressure; a pipe or conduitconnecting the motor with the source oi fluid-pressure; anauxiliary-valve apparatus in said pipe, coinprisin g a val ve-bodyhaving a restricted inlet, an inlet-valve, a discharge-passage leadingto the motor, an exhaust-port, an exhaust-valve for controlling thesame, a stein engaging said valve and serving to hold it to its seatwith a predetermined yielding pressure; and means for varying oradjusting said pressure, substantially as described.

1l. The combination in a heat-regulating apparatus, of a mainheat-controlling valve; a motor for actuating said valve; a source offluid-pressure; a pipe or conduit connecting the motor with the sourceof fluid-pressure; an auxiliary-valve apparatus having an inlet, anoutlet, and an exhaust-port, a valve between the inlet and outlet ports,an exhaustvalve for controlling the exhaust-port, a stem for saidexhaust-valve separate from the inlet-valve but arranged to move bothvalves; and thermostatically-controlled electrical devices for actuatingsaid stem. V

12. In a temperature-regulatin g apparatus, the combination of a mainheat-controlling valve; a motor for actuating said valve; a source offluid-pressure; a pipe or conduit connecting the motor with the sourceof fluidpressure; auxiliary-valve apparatus for governing the flow offluid under pressure to and from the motor, comprising a valve bodyprovided with inlet, outlet, and exhaust passages, a valve between theinlet and outlet passages for regulating the admission of fluid underpressure, a stem for said valve, an exhaust-valve having an operativeconnection therewith, and a separate actuating-stem operatively engagedwith the exhaust-valve; and thermostatically controlled electricmechanism for actuating said stein.

13. In a temperature-regulating apparatus, the combination of a mainheat-controlling valve; a motor for actuating said valve; a source offluid-pressure; a pipe or conduit connecting the motor with the sourceof fluidpressure; a three-way auxiliary-valve apparatus in said pipe,comprising a tube or nipple having a longitudinal bore through whichfluid can pass and provided at its ends with valve-seats, valves forsaid seats, means ffor connecting said valves extending through the tubeor nipple, a pressure device for moving said valves in one direction,and a second pressure device acting in opposition to the first; and athermostatically-controlled electric apparatus for controlling theaction of the pressure devices and through them the movements of saidvalves.

14:. In a heat-regulating apparatus, the combination of a mainheat-controlling valve; a motor for actuating the same; a source offluid-pressure; a pipe or conduit connecting the motor with the sourceof fluid-pressure; an auxiliary-valve apparatus in said pipe comprisingan inlet-valve, a spring or yield-- ing pressure device tending to closesaid valve, an exhaust-valve operatively connected with the inlet-valve,and a spring or yielding pressure device acting against theexhaust-valve in opposition to the first-mentioned spring; andthermostatically controlled electrical mechanism for controlling saidsprings and through them actuating said valves.

15. In a temperature-regulating apparatus, the combination of a mainheat-controlling valve amotor for actuating the same; a source offluid-pressure; a pipe or conduit connecting the motor with the sourceof fluid-pressure; an electrically controlled auxiliary valve comprisinga valve-body provided wit-h an inlet passage and port, an inlet-valvehaving a stem, an exhaust-port, and an exhaustvalve having a stemoperatively connected with the inlet-valve stem, said exhaust-port andvalve being of greater capacity than the inlet-port and valve; andthermostatic devices for controlling said electrical apparatus andthrough it the movements of said valves.

16. The combination in a heat-regulating apparatus', of a mainheat-controlling valve; a motor for actuating the same; a source offluid-pressure; a pipe or conduit connecting the motor with the sourceof fluid-pressure; an auxiliary-valve body in said pipe having inlet,outlet, and 4exhaust passages, a tube having a longitudinal bore throughwhich fluid will pass and one end of which forms a valve-seat, a valvetherefor having a stem passing through said bore, a spring or itsequivalent tending to close the valve, an exhaust-valve operativelyconnected with the first-mentioned valve, an actuating-stem operativelyconnected with the exhaust-valve, and a spring or its equivalent actingthereon in opposition to the first-mentioned spring; and athermostatically-controlled electrical apparatus for actuating saidvalves.

17. In atemperature-regulating apparatus,

IOO

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the combination of a main heat-controlling valve, a motor for actuatingthe saine; a source of Huid-pressure; a pipe or conduit connecting themotor with the source of fluidpressure; an auxiliary-valve body in saidpipe having inlet, outlet, and exhaust passages, inlet and exhaustvalves connected by a stem or Stems, one part of which extends throughthe inlet-passage and is smaller than said passage, and the other partof which extends through'the exhaust-passage to the exhaustvalve and lislarger than the first-mentioned part of said stem or stems but smallerthan said exhaust-passage, and means for holding the exhaust-valve toitsseat with a yielding pressure when pressure is on the motor; and athermostaticallycontrolled electrical device for governing lthemovements of said valves.

1S. In combination with a main heat-con trollingvalve or device; aHuid-pressure motor for actuating the same; a source of luidpressure; ashell or casing to contain auxiliary valves; a pipe connecting saidcasing and the duid-pressure motor.; an inlet-valve controlling thepassage of fluid to the motor; an exhaustwalve controlling escape offluid from the motor, the opening controlled by the exhaust-'valve beingof greater area than that controlled by the inlet-valve; and a pressuredevice acting upon the exhaust-valve and serving to hold it to its seatwith a predetermined force; whereby said val-ve is adapted to relievethe motor from excessive pressure.

19. In combination with a main heat-controlling valve, damper, ordevice, and with a source of huid-pressure; a Huid-pressure motor; apipe connecting the source of pressure and the motor; a shell or casinginterposed between the source of pressure and the ntor; an inlet-valve ghaving stem i, head j and spring la; an exhaust-valve m having stem Zarranged to bear upon head j; and an unpacked stem q extending throughthe valve shell or casing, provided with a disk to seal the openingthrough which it passes, and arranged to bear upon and to close theexhaustvalve, substantially as set forth.

20. In a temperature-regulating apparatus in which an auxiliary valve isemployed to control the delivery and exhaust of fluid to and from afluid-pressure motor which actuates the main valve, an auxiliary-valveshell or casing provided with a longitudinally-adjustable thimble'f; avalve g applied to the mouth of said thimble and provided with stem fi;and an exhaust-valve Z in alinement with valve g, the adjustment of thethimble serving to determine the relative positions and consequentmovements of the two valves.

21. In a temperature-regulating apparatus of the character described,the combination with the exhaust-valve thereof; of an unpacked stemadapted to act thereon; a lever for moving said stem outward; a lockingdevice for holding said lever in a depressed position, and a yieldingconnection between the lever and the stem whereby the stem is en-` abledto move independently of the lever,

and thus to free or open the exhaust-valve without affecting the lever.

Signed this 31st day of May, 189,5.

JOHN V. STOUT. Witnesses:

ED. Q. SMITH, `ABRAHAM WARD, J r.

